20" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w16h16 + Product Details Size –

+ Product Details Size – 26"w X 10"h is the size for the duct opening measurement only

+ Product Details Size – 10"w X 22"h is the size for the duct opening measurement only

+ Product Details Size - 22"w X 22"h is the size for the duct opening measurement only

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20" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w16h16 + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 20" x 28" OR 28" x 20" duct opening (measured at the opening), with actual outer dimensions of 22. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 19. 75" x 27. 75" x 1" Premium Airflow Efficiency High performance cube core eggcrate design allows 95% airflow efficiency, reducing energy costs and maximizing HVAC system lifespan. Durable, Rust Free Aluminum